Order the Trains

Explicit Instruction/Teacher modeling

• Model counting from 0-20, using a number line you have drawn on the board.
• Explain that when we count, there is always an order. We can start from zero and count in order to 20.
• Write the numbers 0-5 on the board. Say, "Let's count these together." Count them aloud with students echo counting and think aloud to say, "Wait! Something is wrong. One of these numbers is out of order." Model how to use the number line to put the two and three back in the right places.
• Using the Vocabulary Cards, explain the definition of least and greatest. Point to the number zero and say, "This is the least or smallest number on the number line, see how it is all the way to left, just like the train engine? Now let's look at number 20. It is the greatest or biggest number on the line, it is all the way to the right-just like the caboose!"

Guided Practice

• Draw three train cars on the board.
• Tell the class that you need to order the trains from least to greatest and you need their help.
• Write the number zero on the board and ask, "Which train car should zero go in?" Have students turn and talk to share their ideas with a partner.
• Point to each car in turn and ask students to give a thumbs up when you point to the car where the zero should go.
• Review the concept that zero is the least and must start on the left or in the engine.
• Repeat process with the number one and two. If further practice is needed, draw additional train cars and order numbers 0-10.

Group work time

• Explain that now students will get to practice ordering their very own teen number train!
• Display the worksheet and go over the directions.
• Tell students that before gluing their train cars, they will get checked by a partner to make sure they are ordered from least to greatest.
• Send students to work.